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i ordinary process of working under thc vacuum-pan system.

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Lema-'Patent No. 77,065, daad April 21,1868.

IMPROVED VACUUM-PAN APPARATUS.

' @tigt rlgttule tratta fait itat Estat inituttni mating tnt ti its time TO ALL WHOM IT MAY CONCERN: -fBeit known that I, FRANZ O. MATTHIESSEN, of Jersey City, in the county of Hudson, and State of New Jersey, have invented a new and useful Improvement in Vacuum-Pan Apparatus, of which the following is a full, clear, and exact description, reference being had tothe' accompanying drawing, forming part oithisspeciiication, and in whichv .Figure 1 represents a view in elevation of a vacuum-pan, with my improvement as applicd or attached thereto, and

Figure 2 a plan of the same. Similar letters of reference indicate corresponding parts..

This my improvement will bebest explained bythe 'following prefatory remarks with reference to the Thus, in boiling sugar or molasses, although it is very desirable in many instances to keep up the process. in a continuous or unbroken'mannen'this is net practicable under lthe ordinary construction of vacuum-pan, or method of' working. Itis usual, for instance, under such system, rst, to set 'the air-pump in operation, to create a vacuum in the pan, a cock at the same time being opened Ato establishy ycommunication between the pan und tanks containing the liquidto be boiled, in orcler that, as; soonas the vacuum rises sufciently,the liquid will, by the pressure of the Aoutside atmosphereupon it, be forced into the pan. -After a proper quantity of liquid has been thus supplied to the pan, steam is turnedon, and the boi-ling commenced and continued tillthc pun is iilled. It then becomes necessary'to wholly or partly'empty the panof its contents to admit of a second for fresh supply. of the-liquid from the tanks, to undergo the likeprocess ofboiling, and to effect these repeated cmptyin'gs each successive boiling, atmospheric air from the outside has to be yintroducedfwithin the panby opening a suitable cock or valve, and the contentsfrunofi inte avessel by opening a valve in the bottom of the pan, after which, to start the pan for a second boiling, it' becomes necessary to-,commence as anew, by exhausting the vacuum-pan of air, thus causing considerable loss of time, power, and steam on each occasion' that the vacuum is destroyed for the purpose of running 'oia charge as it`is boiled.l

My improvement has for its object the remedying of this defect, and'my invention consists in such a combination of devices with the vacuum-pan properas that a boiling, or any portion of a boiling, may b e run oit without destroying the vacuum in the pan, whereby the processof boiling under thc vacuum-pan .system may bc kept up in a continuous o r unbroken manner, thereby saving time, labor,and the steam used in boiling the liquidi In illustrationI of how this my improvement is or may be carried into practice, A represents an'air-tight vessel, which may be o fa'ny suitable size andshapo, andis in connection, by a pipe,'B, with the discharge-pipe from the pan C under control of the usual bottom valve. This' vessel'A is also connected by a pipe, D, that is controlled by a cock, b, with the upper or other suitable partofthe pan, so lth'at when'the air-pump establishes avaeuum in the pan, it also, by opening the cock b', creates a vacuum in the air-tight tank or vessel A, which is likewise provided with a pipe, E, having a cock,`,c, for establishing communication with the, or a separate,- air-pump, and is further provided with an air-cock, d, discharge-pipe, and cock;' e, land,f it may be, water gauge, and other of the\usual appurtenances tovacuum-pans. i The operation is as follows: The pan C is started -in the usual way, but the connection between the ain tight tank or vessel vA and pan Gis allowed to be open by suitably turning the cock b, so that there lwill'be the' same range of vacuum in both vessels. After the pan C is filledthe bottom valve to theidischargeoutlet from the latter is opened, and the contents of the pan, or any desired portionithereof, run .off in to the auxiliary air# vtight tank A, without interruption to the boiling lin the pan. Upon the requiredquantity ot" theboiled liquid having been thusdischarged from the pan, the bottom valve to the latter is shut, and the cock b also closed,- wherebyallcommunication, both above and below, between the auxiliary yvessel A and pau-C is shut oi. Air is tnen allowed to enter the vessel Aby opening the cock 0l, -when, on openingthe discharge-cock eatithebottOm'of tiievessel A, the contents of the latter can be run oii for further treatment,as required, after which the dishargecock e and air-cock'd are again shut,va,ud the nir exhausted from tbe'vessslA by opening the cock', and sucking on the pipe E. This'puts the vesscl A icondition to.lmve its connection again established witlrtheupper portion oi' the pan C theppe D, which is done by opening the cockb, and stopping, say.,y at the same time, Aall further fiction of the nir-pump en the pipe E, andclosing the cock ic. The` apparatus ih thenr reodyforn Y repetition off-the ,drawing-of pocess,`la.s' described, and which may be repeated indefinitely without destroying 'the imcuum in the pan, or arresting the boiling that is or may be thus made continuons.

. By thismy improvement, seven nan-charges maybe run'oii` in the same time as it takes to discharge six under the-ordinary process.`

What is here-claimed, and desired to' besecuredby Letters :Patent,pis i p l The combination, with the vacuum-pan, of un anxilicryuir-tight tank or vessel, provided'with suitable nir und dischnrge-oocks or vulves, afnd having connections under the control of appropriatecocks or vulves, with un air-pump, or its equivalent, and-with the Yncunmpun, both nbove and below, for operation in the manner described, and whereby a. boiling or any portion of boilingymay be runbif without destroying the vacuum ir the pan, and a. continuous boiling therein be keptup, substnntilly as specified.'

' F. o.` MATTHIESSEN.

Witnesses:

A. LE CLERC, J. W. CooMns. 

